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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27722e54efe3cf7b3280fc4fa9aef21bb24f3c440ad998e22e495a4950be5dfd' 
  AND token = 'JdbfesCIxk1iXbTk7q2GO3HOFQRJeSrF5cBBJrp5B60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}